SPF/DB preparation method of titanium alloy hollow rib structure

Abstract

The invention relates to an SPF / DB preparation method of a titanium alloy hollow rib structure. The method comprises the following steps that an upper core plate and a lower core plate are cut out, the upper core plate and the lower core plate are made of titanium alloy hollow plates with lattice type solid nodes, each connecting rib strip is of a strip-shaped groove structure, solid nodes are formed at the crossed positions of the connecting ribs, the upper core plate and the lower core plate are oppositely buckled to form the middle core plate, and the strip-shaped groove structures can forma hollow rib structure; two side plates of the titanium alloy hollow structure are machined, and a reinforcing block is machined; and a low-carbon steel ladle sleeve with a block-shaped groove on theinner side surface is machined, a middle core plate which is formed by buckling the upper core plate and the lower core plate, the two side panels and peripheral low-carbon steel ladle sleeves are sequentially stacked and packaged from inside to outside, reinforcing blocks are additionally arranged between the joint of the two side plates and the low-carbon steel ladle sleeves, diffusion connection and superplastic forming are performed to obtain the hollow rib lattice structure, and finally the low-carbon steel ladle sleeves and the reinforcing blocks are removed.

Description

technical field [0001] The invention relates to the technical field of superplastic forming / diffusion connection, in particular to an SPF / DB preparation method of a titanium alloy hollow bar structure. Background technique [0002] The three-dimensional lattice structure of titanium alloy and superalloy can be prepared by superplastic forming / diffusion bonding (SPF / DB), see figure 1 shown. The method of SPF / DB can be used to prepare pyramidal and X-shaped titanium alloys, and hot isostatic pressing can be used for diffusion bonding, and then superplastic forming can be used to prepare three-dimensional lattice structures of superalloys. [0003] In the prior art, there are some deficiencies in the preparation of metal three-dimensional lattice structures by superplastic forming / diffusion bonding technology, mainly including: [0004] 1. The ribs are solid, while the hollow ribs can make the three-dimensional lattice structure have the best mechanical properties. It is stil...

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Problems solved by technology

[0004] 1. The ribs are solid, while the hollow ribs can make the three-dimensional lattice structure have the best mechanical properties. It is still difficult to prepare the three-dimensional lattice structure of the hollow ribs with the current technology;

[0005] 2. After adopting the lattice structure of hollow ribs, the thickness of the cross-section of the ribs is relatively thick, and it is easy to form groove defects on the panel during superplastic forming

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